Linked Questions

10 votes
6 answers
6k views

Guess a number between 1 to 27 with 3 Yes/No/Maybe questions [duplicate]

Your best friend (Bob) comes to you with this problem. The Problem His teacher (Mr. Sam) will ask Bob to work out a number in his head between 1 and 27. Bob has to find the correct number, by asking ...
user avatar
-2 votes
4 answers
434 views

What's my number? [duplicate]

I am thinking of an integer $1,2$ or $3$. You can ask me only a single question to which I can reply "Yes", "No" or "I don't know". I will be completely honest. What will you ask me to figure out what ...
user avatar
  • 237
1 vote
2 answers
190 views

Thinking of O or 0 or O [duplicate]

I am thinking of one thing. It is either an ellipse (shape), Or, it is the letter O Or, it is the number 0 You can ask me one question and guess what the thing is. I can only answer No,or ...
user avatar
  • 38.7k
29 votes
3 answers
5k views

Differentiate between the numbers from 1 to 5 with one single yes/no question

This question requires a bit of logical distortion to get the information required to answer the question. However, I've never seen it asked before what would happen if more modes of question ...
user avatar
3 votes
15 answers
14k views

Three doors, one question

A prisoner wakes up in an empty room (being seated on the floor against the wall). There are three solid doors on three of the room's walls: one to his left, one in the middle in front of him and one ...
user avatar
  • 686
7 votes
8 answers
1k views

Thinking of a shape

This is on a similar thought process as a 2 year old puzzle on this site: You have one question to tell whether the number I'm thinking of is 1, 2, or 3 I am thinking of a shape. It is either a ...
user avatar
  • 38.7k
7 votes
3 answers
819 views

Gaby and Jack's Number Guessing Game

Gaby, a good mathematician, thinks of a whole number between 1 and 100 inclusive. What is the least number of questions Jack needs to ask her, and what questions should those be, if he is to work out ...
user avatar
3 votes
4 answers
492 views

Classic 2 Guards But With 3 Doors Instead

So the rules are almost the same : You get to ask just one question to whichever guard you want to (just 1 guard; asking both guards is not allowed) There are 2 guards, one tells the truth and ...
user avatar
  • 3,705
0 votes
2 answers
524 views

Is there probability based Knight-Knave puzzles?

Have you seen Knight-Knave puzzles based on probability rather then facts? For example a puzzle with condition like this: Knight tells the answer, probability to which according to his knowledge is ...
user avatar
  • 15.8k
0 votes
6 answers
270 views

Guessing among 3 possibilities with a single question - can this be done with letters as well as numbers?

This is an open question to all. I have seen a few " I am thinking of a number/s-- can you guess by asking one question to which I can only answer Yes, No or may be" puzzles which are interesting ...
user avatar
  • 38.7k